WO2018218691A1 - Flexible ultrathin glass with high contact resistance - Google Patents

Flexible ultrathin glass with high contact resistance Download PDF

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Publication number
WO2018218691A1
WO2018218691A1 PCT/CN2017/087100 CN2017087100W WO2018218691A1 WO 2018218691 A1 WO2018218691 A1 WO 2018218691A1 CN 2017087100 W CN2017087100 W CN 2017087100W WO 2018218691 A1 WO2018218691 A1 WO 2018218691A1
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WIPO (PCT)
Prior art keywords
glass article
glass
mpa
equal
dol
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PCT/CN2017/087100
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English (en)
French (fr)
Inventor
Ning DA
Feng He
Jiaqi MENG
Mathew SHAN
Original Assignee
Schott Glass Technologies (Suzhou) Co. Ltd.
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Application filed by Schott Glass Technologies (Suzhou) Co. Ltd. filed Critical Schott Glass Technologies (Suzhou) Co. Ltd.
Priority to CN201780091519.7A priority Critical patent/CN110770179A/zh
Priority to KR1020197027286A priority patent/KR102512670B1/ko
Priority to PCT/CN2017/087100 priority patent/WO2018218691A1/en
Priority to JP2019548019A priority patent/JP7184791B2/ja
Publication of WO2018218691A1 publication Critical patent/WO2018218691A1/en
Priority to US16/700,577 priority patent/US11465930B2/en

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
    • C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
    • C03C21/002—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions to perform ion-exchange between alkali ions
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
    • C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium

Definitions

  • the invention is related to an ultrathin glass article with both high sharp contact resistance and high flexibility.
  • the invention is also related to use of the high strength flexible glass as flexible universal plane in flexible and printed electronics, sensor for touch control panels, finger print sensors, thin film battery substrates, mobile electronic devices, semiconductor interposers, bendable displays, solar cells, or other applications where a combination of high chemical sta-bility, temperature stability, low gas permeability, flexibility, and low thickness is necessary.
  • Be-sides consumer and industrial electronics said invention could also be used for protection appli-cations in industrial production or metrology.
  • Thin glasses with different compositions are suitable substrate material for many applications where transparency, high chemical and thermal resistance, and defined chemical and physical properties are important.
  • alkaline free glasses can be used for display panels and as electronic packaging materials in wafer format.
  • the alkaline contained silicate glasses are used for filter coating substrate, touch sensor substrate, and fingerprint sensor module cover.
  • Aluminosilicate (AS) , lithium aluminosilicate (LAS) , borosilicate and soda-lime glasses are wide-ly used for applications such as covers for finger print sensor (FPS) , protection cover, and dis-play cover.
  • the glasses usually will be chemically toughened to achieve a high mechanical strength, as determined by special tests, e.g. 3-point bending (3PB) , ball drop, anti-scratch and others.
  • 3-point bending (3PB) 3-point bending
  • Chemical toughening is a well known process to increase strength of glass like soda lime glass or aluminosilicate (AS) glass or lithium aluminosilicate (LAS) or borosilicate glass that is used as cover glass for display applications, for example.
  • the surface compressive stresses (CS) are typically between 500 and 1,000 MPa and the depth of the ion-exchange layer is typically bigger than 30 ⁇ m, preferably bigger than 40 ⁇ m.
  • AS Glass could have exchange layers bigger than 100 ⁇ m.
  • thickness of glass usually ranges from about 0.5 mm to 10 mm.
  • ⁇ 0.5mm thick flat ultrathin glasses can be produced by direct hot-forming methods such as down draw, overflow fusion or special float procedures. Redraw methods are also pos-sible. Compared with post-treated thin glass by chemical or physical method (e.g. produced via grinding and polishing) , the direct hot-formed thin glass has much better surface uniformity and surface roughness because the surfaces are cooled down from high temperature melting state to room temperature. Down-drawn method could be used to produce glass thinner than 0.3 mm or even 0.1 mm, such as aluminosilicate glasses, lithium aluminosilicate glasses, alkali borosili-cate glasses, soda lime glasses or alkaline free aluminoborosilicate glasses.
  • the purpose of invention is to overcome the problems of the prior art and to provide an ultrathin glass which can achieve both high flexibility and high sharp contact resistance. It is a further object of the invention to set evaluation criteria for UTG having reliable properties for electronic applications.
  • the glass article can be of any size.
  • it could be a long ultrathin glass ribbon that is rolled (glass roll) , a large glass sheet, a smaller glass part cut out of a glass roll or out of a glass sheet or a single small glass article (like a FPS or display cover glass) etc.
  • Thickness (t) The thickness of a glass article is the arithmetic average of the thickness of the sample to be measured.
  • Compressive Stress The induced compression among glass network after ion-exchange on the surface layer of glass. Such compression could not be released by deformation of glass and sustained as stress. CS decreases from a maximum value at the surface of the glass article (surface CS) towards the inside of the glass article.
  • Commercially available test machine such as FSM6000 (company “Luceo Co., Ltd. ” , Japan/Tokyo) could measure the CS by waveguide mechanism.
  • Depth of Layer (DoL) The thickness of ion-exchanged layer, a region where CS exists.
  • Com-mercially available test machine such as FSM6000 (company “Luceo Co., Ltd. ” , Japan/Tokyo) could measure the DoL by wave guide mechanism.
  • CT Central Tension
  • Average roughness (R a ) A measure of the texture of a surface. It is quantified by the vertical deviations of a real surface from its ideal form. Commonly amplitude parameters characterize the surface based on the vertical deviations of the roughness profile from the mean line. R a is arithmetic average of the absolute values of these vertical deviations.
  • Breakage height is the height (given in mm) from which an object of a defined weight can fall onto a chemically toughened ultrathin glass article until the glass article breaks (that means: cracks are generated) .
  • the breakage height is determined by sandpaper ball drop test which is described in more detail below.
  • Breakage bending radius (given in mm) is the minimum radius (r) of the arc at the bending position where a glass article reaches the maximum deflec-tion before kinking or damaging or breaking. It is measured at the inside curvature at the bend-ing position of a glass material. A smaller radius means greater flexibility and deflection of glass.
  • the bending radius is a parameter depending on the glass thickness, the Young’s modulus and the glass strength. Chemically toughened ultrathin glass has very small thickness, low Young’s modulus and high strength. All the three factors contribute to low bending radius and better flex-ibility. The test for determining the BBR is described in more detail below.
  • the invention provides a chemically toughened glass article having a thickness (t) of less than 0.4 mm, a first surface and a second surface and a compressive stress region extending from the first surface to a first depth in the glass article (DoL) , the region is defined by a compressive stress (CS) wherein a surface CS at the first surface is at least 100 MPa.
  • the first surface and the second surface are located on opposite sides of the glass article.
  • the glass article has a breakage height (given in mm) of at least the figure of the thickness (t in mm) of the glass article multiplied by 50. The breakage height is determined in a sandpaper ball drop test.
  • the glass article is placed with its second surface on a steel plate and the first surface of the glass article is loaded until breakage by a 4.5g acrylic ball dropped from above wherein a sand-paper of type P180 is placed on the first surface of the glass article wherein the abrasive side of the sandpaper is in contact with the first surface.
  • the glass article according to the in-vention has a breakage bending radius (given in mm) of less than the thickness (t in mm) of the glass article multiplied by 100000, wherein the result is divided by the figure of the surface com-pressive stress (in MPa) measured at the first surface.
  • Such a glass article according to the invention has an optimized stress profile. It has the bal-ance between small bending radius and high sharp contact resistance especially impact re-sistance. Surprisingly it was found that the glass article will be reasonable strong enough to ac-commodate the applications of ultrathin glass articles especially in daily use if the following con-ditions are fulfilled:
  • the glass article has a breakage height (given in N) of ⁇ 50 * t in the above mentioned sandpaper ball drop test (t being the figure of the respective thickness of the glass article in the unit “mm” ) and
  • the breakage height criterion for an ultrathin glass can be described by the inventive factor 50 and the thickness of the glass article.
  • the inventive factor will be valid if the breakage height of the glass article is determined in the sandpaper ball drop test. In this dynamic test, the glass article is placed with its second surface on a steel plate and the first surface of the glass article (which is chemically toughened) is orientated upwards. An acrylic ball having a weight of 4.5 g is dropped from above onto the glass article. Step by step the drop height of the ball is increased until the glass article breaks wherein there is one drop per each step and the distance between each step is chosen reasonably.
  • the test is per-formed on small samples (11 mm x 11 mm) at room temperature of about 20°C and relative humidity of about 50%using sandpaper P180 according to ISO 6344 (e.g. #180 Buehler sand-paper manufactured by the company “Buehler” ) . If a glass article of larger size is to be tested, small samples will be cut out using a diamond cutting wheel. No further edge treatment is per-formed on the small samples.
  • the breakage height also called “sandpaper ball drop height”
  • Breaking means that the glass article gets a visible surface crack (crack is generated) or breaks into two or several piec-es. The breakage here is determined with the naked eye.
  • This test is adjusted to and is especially suitable for ultrathin glass articles and reproduces in a quite simple manner the above mentioned problem, that is the impact contact between the glass article (e.g. a FPS or a touch display) and a sharp hard object when the glass article falls down or is hit.
  • the glass article e.g. a FPS or a touch display
  • the breakage bending radius criterion for an ul-trathin glass can be described by the inventive factor 100000, the thickness and measured sur-face CS of the glass article.
  • the inventive factor will be valid if the breakage bending radius of the glass article is determined in a 2 point bending test as described now.
  • the breakage bend-ing radius is determined by using a UTM (universal testing machine) on small samples (20 mm x 70 mm) at room temperature of about 20°C and relative humidity of about 50%. If a glass arti-cle of larger size is to be tested, small samples will be cut out using a diamond cutting wheel. No further edge treatment is performed on the small samples.
  • the glass article is brought into a bent position and its opposite ends are positioned between two parallel plates (steel plates) . Then the distance between the plates is lowered continuously so that the bending radius of the glass article decreases until breakage wherein the loading speed is 60mm/min. The distance between the plates is recorded when the ultrathin glass article is kinking or damaging or break-ing into two or several piece which is determined by the signal of the UTM software. From that distance the corresponding bending radius of the glass article at the time of breakage is calcu-lated. -If glass articles with treated edges are tested (wherein the glass articles may be for ex-ample edge treated by CNC grinding, etched by acid (e.g.
  • the bending radius will even be smaller compared to corre-sponding glass articles without treated edges because edge treatment increases the strength and thus decreases the bending radius.
  • This 2 point bending test is adjusted to and is especially suitable for ultrathin glass articles and reproduces in a quite simple manner the above mentioned problem, that is the bending of a glass article (e.g. a FPS or a touch display) upon loading it.
  • a glass article e.g. a FPS or a touch display
  • the 2 point bending method is more meaningful than other known bending strength tests such as 3 and 4 point bending tests.
  • the breakage bending radius (in mm) of the chemically toughened glass article is less than the thickness (t in mm) of the glass article multi-plied by 80000 wherein the result is divided by the figure of the surface compressive stress (in MPa) measured at the first surface ( ⁇ t * 80000/CS) .
  • the breakage bending radius (in mm) can be less than the thickness (t in mm) of the glass article multiplied by 70000 wherein the result is divided by the figure of the surface compressive stress (in MPa) measured at the first surface ( ⁇ t * 70000/CS) .
  • the breakage bending radius (in mm) can be less than the thickness (t in mm) of the glass article multiplied by 60000 wherein the result is divided by the figure of the surface compressive stress (in MPa) measured at the first surface ( ⁇ t * 60000/CS) .
  • ultrathin glass articles are used in many fields of daily applications, e.g. as cover for finger print sensors especially in smartphones and tablets.
  • cover glass toughening preferably chemically toughening
  • CS compressive stress
  • CT central tension
  • a crack will result that extends through the strengthened layer of the cover glass (that is defined by a compressive stress (CS) ) and reach-es the tensile part of the glass even if the contact force has been quite low. Due to the high cen-tral tensile stress existing in that glass region the known glass article cracks spontaneously and the cover glass is damaged.
  • CS compressive stress
  • the glass articles according to the invention are more reliable concerning flexibility and impact resistance in the further processing and daily use.
  • the reason for that is the improved and optimized stress profile of the glass articles according to the invention.
  • an ultrathin glass article meets the claimed breakage height and the claimed breakage bending radius (referred to its respective thickness and meas-ured surface CS) , the breakage risk of the inventive glass article when being used (e.g. as cov-er glass for example of a finger print sensor) is low.
  • a plurality of samples are measured regarding breakage height using the sandpaper ball drop test. For this a random sample N values is taken. N should be high enough to obtain a statistically ensured average value. Preferably at least 20, more preferably at least 30 samples are tested. The number of samples depends on the respective size of the glass article to be tested.
  • the measured values are statistically evaluated using Weibull method. B10 value of Weibull distribution (that is the calculated height (in mm) wherein 10%of the samples are broken) is determined and taken to represent the claimed breakage height.
  • an average value can be calculated. For this a random sample of N values is taken. The number of samples depends on the respective size of the glass article to be evaluated. Preferably N should be high enough to obtain a statistically ensured average value. Preferably at least 20, more preferably at least 30 samples are tested. Thus, a random sample of N values is taken for the breakage bending radii R 1 ...R N , and, for the values of these random samples, the average value
  • the average breakage bending radius is taken to represent claimed breakage bending radius.
  • a single measured value of breakage bending radius is sufficient and is taken to represent claimed breakage bending radius.
  • Average value and variance of the breakage height are calculated accordingly.
  • the glass is an alkali-containing glass, such as alkali aluminosilicate glass, alkali silicate glass, alkali borosilicate glass, alkali aluminoborosilicate glass, alkali boron glass, alkali germinate glass, alkali borogermanate glass, alkali soda lime glass, and combinations thereof.
  • alkali-containing glass such as alkali aluminosilicate glass, alkali silicate glass, alkali borosilicate glass, alkali aluminoborosilicate glass, alkali boron glass, alkali germinate glass, alkali borogermanate glass, alkali soda lime glass, and combinations thereof.
  • the ultrathin glass article according to the invention has a thickness of less than or equal to 400 ⁇ m, preferably less than or equal to 330 ⁇ m, also preferably less than or equal to 250 ⁇ m, fur-ther preferably less than or equal to 210 ⁇ m, preferably less than or equal to 180 ⁇ m, also pref-erably less than or equal to 150 ⁇ m, more preferably less than or equal to 130 ⁇ m, more prefer-ably less than or equal to 100 ⁇ m, more preferably less than or equal to 80 ⁇ m, more preferably less than or equal to 70 ⁇ m, further preferably less than or equal to 50 ⁇ m, further preferably less than or equal to 30 ⁇ m, even preferably less than or equal to 10 ⁇ m.
  • the thickness can be at least 5 ⁇ m. Such particularly thin glass articles are desired for various applications as de-scribed above. In particular, the thin thickness grants the glass flexibility.
  • the glass article can be a flat article and/or flexible article and/or deformable article.
  • a “flat” article can for example be an essentially plane or pla-nar glass article.
  • “flat” in the sense of the inventions also includes articles deformable or deformed in two or three dimensions.
  • the glass should content fair amount of alka-line metal ions, preferably Na 2 O, furthermore, adding less amount K 2 O to glass composition can also improve chemical toughening rate. Furthermore, it is found that adding Al 2 O 3 to glass com-position can significantly improve the toughening performance of glass.
  • SiO 2 is the major glass network former in the glasses of the present invention. Additionally, also Al 2 O 3 , B 2 O 3 and P 2 O 5 may be used as glass network formers.
  • the content of the sum of SiO 2 , B 2 O 3 and P 2 O 5 should not be less than 40%for common production method. Otherwise, the glass sheet may be difficult to form and could become brittle and loose transparency.
  • a high SiO 2 content will require high melting and working temperature of glass production, usually it should be less than 90%.
  • the content of SiO 2 in the glass is between 40 and 75 wt. -%, more preferred between 50 and 70 wt. -%, even more preferably between 55 and 68 wt. -%.
  • the content of SiO 2 in the glass is between 55 and 69 wt. -%, more preferred between 57 and 66 wt. -%, even more preferably between 57 and 63 wt. -%.
  • the content of SiO 2 in the glass is between 60 and 85 wt. -%, more preferred between 63 and 84 wt. -%, even more preferably between 63 and 83 wt. -%.
  • the content of SiO 2 in the glass is between 40 and 81 wt. -%, more preferred between 50 and 81 wt. -%, even more preferably between 55 and 76 wt. -%. Adding the B 2 O 3 and P 2 O 5 to SiO 2 could modify the network property and reduce the melting and working temperature of glass. Also, the glass network former has big influence on the CTE of glass.
  • the B 2 O 3 in the glass network forms two different polyhedron structures which are more adaptable to loading force from outside. Addition of B 2 O 3 can usually result in lower ther-mal expansion and lower Young’s modulus which in turn leads to good thermal shock re-sistance and slower chemical toughening speed through which low CS and low DoL could be easily obtained. Therefore, the addition of B 2 O 3 to ultrathin glass could greatly improve the chemical toughening processing window and ultrathin glass and widen the practical application of chemically toughened ultrathin glass.
  • the amount of B 2 O 3 in the glass of the invention is between 0 and 20 wt. -%, more preferably between 0 and 18 wt.
  • the amount of B 2 O 3 can be between 0 and 5 wt. -%, preferably between 0 and 2 wt. -%. In another embodiment the amount of B 2 O 3 can be between 5 and 20 wt. %, preferably between 5 and 18 wt. -%. Ifthe amount of B 2 O 3 is too high, the melting point of the glass may be too high. Moreover, the chemical tough-ening performance is reduced when the amount of B 2 O 3 is too high. B 2 O 3 free variants can be preferred.
  • Al 2 O 3 works both as glass network former and glass network modifier.
  • the [AlO 4 ] tetrahedral and [AlO 6 ] hexahedral will be formed in the glass network depending on the amount of Al 2 O 3 , and they could adjust the ion-exchanging speed by changing the size of space for ion-exchange inside glass network.
  • the content of this component varies depending on the respec-tive glass type. Therefore, some glasses of the invention preferably comprise Al 2 O 3 in an amount of at least 2 wt. -%, more preferably in an amount of at least 10 wt. -%or even at least 15 wt. -%.
  • some glasses of the invention preferably comprise Al 2 O 3 in an amount of at most 30 wt. -%, more preferably at most 27 wt. -%, more preferably at most 25 wt. -%.
  • Some advantageous embodiments can comprise Al 2 O 3 in an amount of at most 20 wt. -%, preferably of at most 15 wt. -%or of at most 10 wt. -%, or even preferably at most 8 wt. %, preferably at most 7 wt. %, preferably at most 6 wt.
  • Some glass variants can be free of Al 2 O 3 .
  • Other advantageous glass variants can comprise at least 15 wt. %, preferably at least 18 wt. %Al 2 O 3 and/or at most 25 wt. %, preferably at most 23 wt. %, more preferably at most 22 wt. %Al 2 O 3 .
  • Alkaline oxides like K 2 O, Na 2 O and Li 2 O work as the glass work modifier. They can break glass network and form non-bridge oxide inside glass network. Adding alkaline could reduce the work-ing temperature of glass and increase CTE of glass.
  • Sodium and lithium content is important for ultrathin flexible glass which is chemical toughenable, for Na + /Li + , Na + /K + , Li + /K + ion exchange is a necessary step for the toughening, the glass will not be toughened if it does not contain alka-line itself.
  • sodium is preferred over lithium because lithium may significantly reduce the diffusivity of the glass. Therefore, some glasses of the invention preferably comprise Li 2 O in an amount of at most 5 wt.
  • Li 2 O can be 3 wt. %, preferably 3.5 wt. %.
  • the glasses of the invention preferably comprise Na 2 O in an amount of at least 4 wt. %, more preferably at least 5 wt. %, more preferably at least 6 wt. %, more preferably at least 8 wt. %, more preferably at least 10 wt. %.
  • Sodium is very important for the chemical toughening perfor-mance as the chemical toughening preferably comprises the ion exchange of sodium in the glass with potassium in the chemical toughening medium.
  • the content of sodium should also not be too high because the glass network may be severely deteriorated and glass may be extremely hard to be formed.
  • ultrathin glass should have low CTE, to meet such requirement glass should not contain too much Na 2 O.
  • the glasses preferably comprises Na 2 O in an amount of at most 30 wt. %, more preferred at most 28 wt. %, more preferred at most 27 wt. %, more preferred at most 25 wt. %, more preferred at most 20 wt. %.
  • the glasses of the invention may comprise K 2 O.
  • the glasses of the invention preferably comprise K 2 O in an amount of at most 10 wt. %, more preferred at most 8 wt. %.
  • Some preferred embodiments com-prises at most 7 wt. %, other preferred embodiments at most 4 wt. %, more preferred at most 2 wt. %, more preferred at most 1 wt. %, more preferred at most 0.1 wt. %.
  • Some preferred embod-iments are even free of K 2 O.
  • the total amount of alkaline content should preferably not be higher than 35 wt. -%, prefera-bly not higher than 30 wt. %, more preferably not higher than 28 wt. %, more preferably not high-er than 27 wt. %, even preferably not higher than 25 wt. %, for the glass network may be severe-ly deteriorated and glass may be extremely hard to be formed.
  • Some variants comprise an alka-line content of at most 16 wt. -%, preferably of at most 14 wt. -%. Another important factor is that ultrathin glass should have low CTE, to meet such requirement glass should not contain too much alkali elements.
  • the glasses should contain alkali elements in order to facilitate chemical toughening. Therefore, the glasses of the present invention pref-erably comprise alkali metal oxides in an amount of at least 2 wt. %, more preferred at least 3 wt. %, more preferred at least 4 wt. %, more preferred at least 5 wt. %, more preferred at least 6 wt. %.
  • Alkaline earth oxides such as MgO, CaO, SrO, BaO work as the network modifier and decrease forming temperature of glass. These oxides can be added to adjust the CTE and Young’s modulus of glass. Alkaline earth oxides have very important function that they can change re-fractive index of glass to meet special requirements. For example, MgO could decrease the re-fractive index of glass and BaO could increase the refractive index.
  • the weight content of alka-line earth oxides should preferably not be higher than 40 wt. %, preferably not higher than 30 wt. -%, preferably not higher than 25 wt. -%, also preferably not higher than 20 wt. -%, more pref-erably not higher than 15 wt.
  • glasses can comprise alkaline earth oxides of at most 10 wt. -%, preferably of at most 5 wt. -%, more preferably of at most 4 wt. -%. If the amount of alkaline earth oxides is too high, chemical toughening performance may be deteriorated. A low-er limit for alkaline earth oxides can be 1 wt. %, or 5 wt. %. Moreover, the crystallization tendency may be increased if the amount of alkaline earth oxides is too high. Some advantageous vari-ants can be free of alkaline earth oxides.
  • transition metal oxides in glass have similar function as alkaline earth oxides and may be comprised in some embodiments.
  • Other transition metal oxides such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , TiO 2 , CuO, CeO 2 , and Cr 2 O 3 , work as coloring agent to make glass with specific optical or photonic functions, for example, color filter or light conver-tor.
  • As 2 O 3 , Sb 2 O 3 , SnO 2 , SO 3 , Cl and/or F could be also added as refining agents in an amount of from 0 to 2 wt. %.
  • Rare earth oxides could also be added to add magnetic or photonic or opti-cal functions to the glass sheet in an amount of 0 to 5 wt. %.
  • the ultrathin flexible glass is alkali metal aluminosilicate glass comprising the following components in the indicated amounts (in wt. %) :
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 .
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 .
  • Sb 2 O 3 , SnO 2 , SO 3 , Cl and/or F could be also added as refining agents in an amount of from 0 to 2 wt. %.
  • Rare earth oxides could also be added to add magnetic or pho-tonic or optical functions to the glass sheet in an amount of 0 to 5 wt. %.
  • the alkali metal aluminosilicate glass of the invention has preferably comprises the following components in the indicated amounts (in wt. %) :
  • Component (wt. %) Li 2 O+Na 2 O+K 2 O 5-28 MgO+CaO+SrO+BaO+ZnO 0-13 TiO 2 +ZrO 2 0-13 P 2 O 5 0-9
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 . 0-2 wt. %of As 2 O 3 , Sb 2 O 3 , SnO 2 , SO 3 , Cl and/or F could be also added as refining agents. 0-5 wt. %of rare earth oxides could also be added to add magnetic or photonic or opti-cal functions to the glass sheet.
  • the alkali metal aluminosilicate glass of the invention comprises the following components in the indicated amounts (in wt. %) :
  • Compohents (wt. %) SiO 2 55-68 Al 2 O 3 10-27 B 2 O 3 0-15 Li 2 O+Na 2 O+K 2 O 4-27 MgO+CaO+SrO+BaO+ZnO 0-12 TiO 2 +ZrO 2 0-10 P 2 O 5 0-8
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 . 0-2 wt. %of As 2 O 3 , Sb 2 O 3 , SnO 2 , SO 3 , Cl and/or F could be also added as refining agents. 0-5 wt. %of rare earth oxides could also be added to add magnetic or photonic or opti-cal functions to the glass sheet.
  • the ultrathin flexible glass is soda lime glass comprising the following com-ponents in the indicated amounts (in wt. %) :
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 . 0-2 wt. %of As 2 O 3 , Sb 2 O 3 , SnO 2 , SO 3 , Cl and/or F could be also added as refining agents. 0-5 wt. %of rare earth oxides could also be added to add magnetic or photonic or opti-cal functions to the glass sheet.
  • the soda lime glass of this invention preferably comprises the following components in the indi-cated amounts (in wt. %) :
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 . 0-2 wt. %of As 2 O 3 , Sb 2 O 3 , SnO 2 , SO 3 , Cl and/or F could be also added as refining agents. 0-5 wt. % of rare earth oxides could also be added to add magnetic or photonic or opti-cal functions to the glass sheet.
  • the soda lime glass of this invention preferably comprises the following components in the indi-cated amounts (in wt. %):
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 . 0-2 wt. % of As 2 O 3 , Sb 2 O 3 , SnO 2 , SO 3 , Cl and/or F could be also added as refining agents. 0-5 wt. % of rare earth oxides could also be added to add magnetic or photonic or opti-cal functions to the glass sheet.
  • the soda lime glass of this invention preferably comprises the following components in the indi-cated amounts (in wt. %):
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 . 0-2 wt. %of As 2 O 3 , Sb 2 O 3 , SnO 2 , SO 3 , Cl and/or F could be also added as refining agents. 0-5 wt. %of rare earth oxides could also be added to add magnetic or photonic or opti-cal functions to the glass sheet.
  • the soda lime glass of the invention comprises the following components in the indicated amounts (in wt. %) :
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 . 0-2 wt. %of As 2 O 3 , Sb 2 O 3 , SnO 2 , SO 3 , Cl and/or F could be also added as refining agents. 0-5 wt. %of rare earth oxides could also be added to add magnetic or photonic or opti-cal functions to the glass sheet.
  • the soda lime glass of the invention comprises the following components in the indicated amounts (in wt. %) :
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 . 0-2 wt. % of As 2 O 3 , Sb 2 O 3 , SnO 2 , SO 3 , Cl and/or F could be also added as refining agents. 0-5 wt. % of rare earth oxides could also be added to add magnetic or photonic or opti-cal functions to the glass sheet.
  • the ultrathin flexible glass is lithium aluminosilicate glass comprising the following components in the indicated amounts (in wt. %):
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 .
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 .
  • Sb 2 O 3 , SnO 2 , SO 3 , Cl and/or F could be also added as refining agents in an amount of from 0 to 2 wt. %.
  • Rare earth oxides could also be added to add magnetic or pho-tonic or optical functions to the glass sheet in an amount of 0 to 5 wt. %.
  • the lithium aluminosilicate glass of the invention preferably comprises the following compo-nents in the indicated amounts (in wt. %):
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 . 0-2 wt. %of As 2 O 3 , Sb 2 O 3 , SnO 2 , SO 3 , Cl and/or F could be also added as refining agents. 0-5 wt. %of rare earth oxides could also be added to add magnetic or photonic or opti-cal functions to the glass sheet.
  • the lithium aluminosilicate glass of the invention comprises the following com-ponents in the indicated amounts (in wt. %) :
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 . 0-2 wt. %of As 2 O 3 , Sb 2 O 3 , SnO 2 , SO 3 , Cl and/or F could be also added as refining agents. 0-5 wt. %of rare earth oxides could also be added to add magnetic or photonic or opti-cal functions to the glass sheet.
  • the ultrathin flexible glass is borosilicate glass comprising the following components in the indicated amounts (in wt. %) :
  • Composition (wt. -%) SiO 2 60-85 Al 2 O 3 0-10 B 2 O 3 5-20 Li 2 O+Na 2 O+K 2 O 2-16 MgO+CaO+SrO+BaO+ZnO 0-15 TiO 2 +ZrO 2 0-5 P 2 O 5 0-2
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 .0-2 wt. %of As 2 O 3 , Sb 2 O 3 , SnO 2 , SO 3 , Cl and/or F could be also added as refining agents. 0-5 wt. %of rare earth oxides could also be added to add magnetic or photonic or opti-cal functions to the glass sheet.
  • the borosilicate glass of the invention preferably comprises the following components in the indicated amounts (in wt. %) :
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 .0-2 wt. %of As 2 O 3 , Sb 2 O 3 , SnO 2 , SO 3 , Cl and/or F could be also added as refining agents. 0-5 wt. %of rare earth oxides could also be added to add magnetic or photonic or opti-cal functions to the glass sheet.
  • the borosilicate glass of the invention preferably comprises the following components in the indicated amounts (in wt. %) :
  • coloring oxides can be added, such as Nd 2 O 3 , Fe 2 O 3 , CoO, NiO, V 2 O 5 , MnO 2 , CuO, CeO 2 , Cr 2 O 3 .0-2 wt. %of As 2 O 3 , Sb 2 O 3 , SnO 2 , SO 3 , Cl and/or F could be also added as refining agents. 0-5 wt. %of rare earth oxides could also be added to add magnetic or photonic or opti-cal functions to the glass sheet.
  • the ultrathin glass according to the invention could be produced by polishing down or etching from thicker glass. These two methods are not economical and lead to bad surface quality which is quantified by R a roughness for example.
  • Direct hot-forming production like down draw, overflow fusion method are preferred for the mass production.
  • Redraw method is also advantageous.
  • These mentioned methods are economical and the glass surface quality is high and the ultrathin glass with thickness from 5 ⁇ m (or even less) to 500 ⁇ m could be produced.
  • the down-draw/overflow fusion method could make pristine or fire-polished surface with roughness R a less than 5 nm, preferred less than 2 nm, even preferred less than 1 nm.
  • the thickness could also be precisely controlled ranging from 5 ⁇ m and 500 ⁇ m. The thin thickness grants the glass flexibility.
  • the strengthening can be done by immersing glass into melt salt bath with potassium ions or cover the glass by potassium ions or other alkaline metal ions contained paste and heated at high temperature at certain time.
  • the alkaline metal ions with larger ion radius in the salt bath or the paste exchange with alkaline metal ions with smaller radius in the glass article, and surface compressive stress is formed due to ion exchange.
  • a chemically toughened glass article of the invention is obtained by chemically toughening a chemically toughenable glass article.
  • the toughening process could be done by immersing the ultrathin glass article into a salt bath which contains monovalent ions to exchange with alkali ions inside glass.
  • the monovalent ions in the salt bath has radius larger than alkali ions inside glass.
  • a compressive stress to the glass is built up after ion-exchange due to larger ions squeezing in the glass network. After the ion-exchange, the strength and flexibility of ultrathin glass are surprisingly and significantly improved.
  • the CS induced by chemical toughening improves the bending properties of the toughened glass article and could increase scratch resistance of glass.
  • the most used salt for chemical toughening is Na + -contained or K + -contained melted salt or mixture of them.
  • the commonly used salts are NaNO 3 , KNO 3 , NaCl, KCl, K 2 SO 4 , Na 2 SO 4 , Na 2 CO 3 , and K 2 CO 3 .
  • Additives like NaOH, KOH and other sodium salt or potassium salt could be also used for better controlling the speed of ion-exchange, CS and DoL during chemical toughening.
  • Ag + -containing or Cu 2+ -containing salt bath could be used to add anti-microbial function to ultrathin glass.
  • the chemical toughening is not limited to single step. It can include multi steps in salt bath with alkaline metal ions of various concentrations to reach better toughening performance.
  • the chemically toughened glass article according to the invention can be toughened in one step or in the course of several steps, e.g. two steps.
  • the chemically toughened glass article according to the invention can have just one surface (first surface) where a compressive stress region extending from the first surface to a first depth in the glass article exists, wherein the region is defined by a compressive stress.
  • the glass article comprises only one toughened side.
  • the glass article according to the invention also comprises a second compressive stress region extending from the second sur-face to a second depth in the glass article (DoL) , the region is defined by a compressive stress wherein the surface compressive stress (CS) at the second surface is at least 100 MPa.
  • CS surface compressive stress
  • the second surface is located opposite to the first surface.
  • this preferred glass article is tough-ened on both sides.
  • Compressive stress mostly depends on the composition of glass. Higher content Al 2 O 3 can be helpful to achieve higher compressive stress.
  • the surface compressive stress is preferably below 1200 MPa. After toughening, the ultrathin glass should have high enough compressive stress to achieve high strength. Therefore, preferably surface compressive stress at the first surface and/or at the second surface is equal to or more than 100 MPa, preferably equal to or more than 200 MPa, more preferably equal to or more than 300 MPa, also preferably equal to or more than 400 MPa, further preferably equal to or more than 500 MPa.
  • surface compressive stress is equal to or more than 600 MPa, further preferably equal to or more than 700 MPa, more preferably equal to or more than 800 MPa.
  • CS at the first surface and the CS at the second surface can be essentially the same or can be different.
  • DoL depends on glass composition, but it can increase nearly infinitely with in-creased toughening time and toughening temperature.
  • a defined DoL is essential to ensure the stable strength of toughened glass, but too high DoL increases the self-breakage ratio and the strength performance when the ultrathin glass article is under compressive stress.
  • DoL should be preferably controlled to be quite low (low DoL variant) .
  • the toughening temperature and/or the toughening time is/are reduced.
  • a lower toughening tem-perature may be preferred as DoL is more sensitive to the temperature and a longer toughening time is easily to be set during mass production.
  • a reduced toughening time is also possible in order to decrease DoL of the glass article.
  • x * t/CS means that x is multiplied by the thickness of the glass article and divided by the figure of the measured surface CS wherein x can be 120, 90, 60, 45, 27.
  • the advantageous value of DoL depends in each case on the glass composition, the thickness and applied CS of the respective glass article.
  • glass articles according to the above mentioned advantageous embodiments have a quite low DoL.
  • the CT decreases. If high impact force is applied on such embodiments by sharp objects, the caused defects will just be on the glass surface. Since the CT is reduced significantly the caused defect is not able to overcome the internal strength of the glass article, and thus the glass article does not break into two or several pieces.
  • Such a glass article with low DoL has an improved sharp impact resistance.
  • y * t/CS means that y is multiplied by the thickness of the glass article and divided by the figure of the measured surface CS wherein y can be 27, 45, 60, 90.
  • z * t means that z is multiplied by the thickness of the glass article wherein z can be 0.5, 0.45, 0.4, 0.35.
  • glass articles preferably comprise a coated and/or laminated layer. The coated layer and/or laminated layer can resist defects of scratches induced on the glass surface by sharp objects even if the DoL of the glass article is quite high.
  • a glass article having a low DoL can comprise a coated layer and/or laminated layer too.
  • the laminated polymer layer and/or the coated layer can cover the surface of the glass article completely or partly.
  • the toughened glass article comprises a laminated polymer layer wherein the polymer layer has a thickness of at least 1 ⁇ m, preferably of at least 5 ⁇ m, further preferably of at least 10 ⁇ m, more preferably of at least 20 ⁇ m, most preferably of at least 40 ⁇ m to reach the improved sharp contact resistance.
  • An upper limit for the thickness of polymer layer could be 200 ⁇ m.
  • Lamination can be performed by different known methods.
  • the polymer material can be selected for example from the group consisting of a silicone polymer, a sol-gel polymer, polycarbonate (PC) , polyethersulphone, pol-yacrylate, polyimide (PI) , an inorganic silica/polymer hybrid, a cycloolefin copolymer, a polyole-fin, a silicone resin, polyethylene (PE) , polypropylene, polypropylenepolyvinyl chloride, polysty-rene, styrene-acrylonitrile copolymer, thermoplastic polyurethane resin (TPU) , polymethyl meth-acrylate (PMMA) , ethylene-vinyl acetate copolymer, polyethylene terephthalate (PET) , poly-butylene terephthalate, polyamide (PA) , polyacetal, polyphenyleneoxide, polyphenylenesulfide, fluorinated polymer,
  • PMMA polymethyl meth-
  • the toughened glass article comprises at least at one surface a coated layer comprising a coating material.
  • the coating of a protective layer can be applied by any known coating method such as chemical vapor deposition method (CVD) , dip-coating, spin-coating, ink-jet, casting, screen printing, painting and spaying.
  • CVD chemical vapor deposition method
  • the invention is not limited to those procedures. Suitable coating materials are also known in the art.
  • a duroplastic reaction resin that is a polymer selected from the group consisting of phenoplasts, phenol formaldehyde resins, aminoplasts, urea formalde-hyde resins, melamine formaldehyde resins, epoxide resins, unsaturated polyester resins, vinyl ester resins, phenacrylate resins, diallyl phthalate resins, silicone resins, cross-linking polyure-thane resins, polymethacrylate reaction resins, and polyacrylate reaction resins.
  • the toughened glass article has a CT of less than or equal to 200 MPa, more preferably less than or equal to 150 MPa, more preferably less than or equal to 120 MPa, more preferably less than or equal to 100 MPa.
  • Some advantageous embodiments can have a CT of less than or equal to 65 MPa.
  • Other advanta-geous embodiments can have a CT of less than or equal to 45 MPa.
  • Some variants may even have a CT of less than or equal to 25 MPa.
  • CT central tensile stress
  • the glass articles can be additionally coated for e.g. anti-reflection, anti-scratch, anti-fingerprint, anti-microbial, anti-glare and combinations of these functions.
  • DoL and CT depends on the glass composition (glass type) , glass thickness and toughening conditions.
  • a chemically toughened glass article having a thickness (t) of less than 0.4 mm, a first surface and a second surface and a compressive stress region extending from the first surface to a first depth in the glass article (DoL) , the region is defined by a compressive stress (CS) wherein a surface CS at the first surface is at least 450 MPa, wherein -the glass article has a breakage height (given in mm) of at least the figure of the thickness (t in mm) of the glass article multiplied by 50, wherein the breakage height is determined in a sand-paper ball drop test in which the glass article is placed with its second surface on a steel plate and the first surface of the glass article is loaded until breakage by a 4.5 g acrylic ball dropped from above wherein a sandpaper of type P180 is placed on the first surface of the glass article, wherein the abrasive side of the sandpaper is in contact with the first surface, and -the glass article has a breakage bending
  • the chemically toughened glass article has a DoL (in ⁇ m) in a range of 0.5 ⁇ m to 120 * t/CS ⁇ m, preferably a DoL in a range of 1 ⁇ m to 90 * t/CS ⁇ m, more preferably a DoL in a range of 1 ⁇ m to 60 * t/CS ⁇ m, more preferably a DoL in a range of 1 ⁇ m to 45 * t/CS ⁇ m, further preferably a DoL in a range of 1 ⁇ m to 27 * t/CS ⁇ m, wherein t is given in ⁇ m and CS is the figure of surface compressive stress (given in MPa) measured at the first surface.
  • CT can be less than or equal to 200 MPa, preferably less than or equal to 150 MPa, preferably less than or equal to 120 MPa, more preferably less than or equal to 100 MPa, further preferably less than or equal to 65 MPa, further preferably less than or equal to 45 MPa.
  • the chemically toughened glass article can have a DoL (in ⁇ m) in the range of 27 * t/CS ⁇ m to 0.5 * t ⁇ m, preferably in the range of 45 * t/CS ⁇ m to 0.45 * t ⁇ m, more preferably in the range of 60 * t/CS ⁇ m to 0.4 * t ⁇ m, even preferred in the range of 90 * t/CS ⁇ m to 0.35 * t ⁇ m, wherein t is given in ⁇ m and CS is the figure of surface compressive stress (given in MPa) measured at the first surface.
  • CT can preferably be more than or equal to 27 MPa, further preferably more than or equal to 45 MPa, further preferably more than or equal to 65 MPa.
  • the surface CS at the first surface and/or at the second surface of the glass article can be equal to or more than 450 MPa, preferably equal to or more than 500 MPa, preferably equal to or more than 550 MPa, preferably equal to or more than 600 MPa.
  • the surface CS can be equal to or more than 700 MPa, more preferably equal to or more than 800 MPa.
  • the chemically toughened glass article has a DoL (in ⁇ m) in a range of 0.5 ⁇ m to 120 * t/CS ⁇ m, preferably a DoL in a range of 1 ⁇ m to 90 * t/CS ⁇ m, more preferably a DoL in a range of 1 ⁇ m to 60 * t/CS ⁇ m, more preferably a DoL in a range of 1 ⁇ m to 45 * t/CS ⁇ m, further preferably a DoL in a range of 1 ⁇ m to 27 * t/CS ⁇ m, wherein t is given in ⁇ m and CS is the figure of surface compressive stress (given in MPa) measured at the first surface.
  • CT can be less than or equal to 150 MPa, more preferably less than or equal to 100 MPa, further pref-erably less than or equal to 65 MPa, further preferably less than or equal to 45 MPa.
  • the chemically toughened glass article can have a DoL (in ⁇ m) in the range of 27 * t/CS ⁇ m to 0.5 * t ⁇ m, preferably in the range of 45 * t/CS ⁇ m to 0.45 * t ⁇ m, more preferably in the range of 60 * t/CS ⁇ m to 0.4 * t ⁇ m, even preferred in the range of 90 * t/CS ⁇ m to 0.35 * t ⁇ m, wherein t is given in ⁇ m and CS is the figure of surface compressive stress (given in MPa) measured at the first surface.
  • the CT of these embodiments can be more than or equal to 27 MPa, further preferably more than or equal to 45 MPa, further preferably more than or equal to 65 MPa, further preferably more than or equal to 100 MPa.
  • the surface CS of lithium aluminosilicate glasses at the first surface and/or at the second surface of the glass article can be equal to or more than 350 MPa, equal to or more than 500 MPa, equal to or more than 600 MPa, preferably equal to or more than 700 MPa, more preferably equal to or more than 800 MPa.
  • the chemically toughened glass article has a DoL (in ⁇ m) in a range of 0.5 ⁇ m to 60 * t/CS ⁇ m, more preferably a DoL in a range of 1 ⁇ m to 45 * t/CS ⁇ m, further preferably a DoL in a range of 1 ⁇ m to 27 * t/CS ⁇ m, wherein t is given in ⁇ m and CS is the figure of surface com-pressive stress (given in MPa) measured at the first surface.
  • CT can be less than or equal to 150 MPa, preferably less than or equal to 120 MPa, more preferably less than or equal to 100 MPa, further preferably less than or equal to 65 MPa, further preferably less than or equal to 45 MPa, further preferably less than or equal to 25 MPa.
  • the chemically toughened glass article can have a DoL (in ⁇ m) in the range of 27 * t/CS ⁇ m to 0.5 * t ⁇ m, preferably in the range of 45 * t/CS ⁇ m to 0.45 * t ⁇ m, wherein t is given in ⁇ m and CS is the figure of surface compressive stress (given in MPa) measured at the first surface.
  • the CT in that alternative can be more than or equal to 27 MPa, further preferably more than or equal to 45 MPa, further preferably more than or equal to 65 MPa.
  • the surface CS at the first surface and/or at the second surface of borosilicate glass-es can be equal to or more than 100 MPa, preferably equal to or more than 200 MPa, more preferably equal to or more than 300 MPa.
  • a chemically toughened glass article having a thickness (t) of less than 0.4 mm, a first surface and a second surface and a compressive stress region extending from the first surface to a first depth in the glass article (DoL) , the region is defined by a compressive stress (CS) wherein a surface CS at the first surface is at least 200 MPa at the first surface, wherein -the glass article has a breakage height (given in mm) of at least the figure of the thickness (t in mm) of the glass article multiplied by 50, wherein the breakage height is determined in a sand-paper ball drop test in which the glass article is placed with its second surface on a steel plate and the first surface of the glass article is loaded until breakage by a 4.5 g acrylic ball dropped from above wherein a sandpaper of type P180 is placed on the first surface of the glass article, wherein the abrasive side of the sandpaper is in contact with the first surface, and
  • the glass article has a breakage bending radius (given in mm) of ⁇ 100000 * t/CS, preferably ⁇ 80000 * t/CS, more preferred of ⁇ 70000 * t/CS, further preferred of ⁇ 60000 * T/CS, wherein the thickness t is given in mm and CS is the figure of surface compressive stress (given in MPa) measured at the first surface.
  • the chemically toughened glass article has a DoL (in ⁇ m) in a range of 0.5 ⁇ m to 90 * t/CS ⁇ m, more preferably a DoL in a range of 0.5 ⁇ m to 60 * t/CS ⁇ m, more preferably a DoL in a range of 1 ⁇ m to 45 * t/CS ⁇ m, further preferably a DoL in a range of 1 ⁇ m to 27 * t/CS ⁇ m, wherein t is given in ⁇ m and CS is the figure of surface compressive stress (given in MPa) measured at the first surface.
  • CT can be less than or equal to 150 MPa, less than or equal to 100 MPa, further preferably less than or equal to 65 MPa, further preferably less than or equal to 45 MPa.
  • the chemically toughened glass article can have a DoL (in ⁇ m) in the range of 27 * t/CS ⁇ m to 0.5 * t ⁇ m, preferably in the range of 45 * t/CS ⁇ m to 0.45 * t ⁇ m, more preferably in the range of 60 * t/CS ⁇ m to 0.4 * t ⁇ m, wherein t is given in ⁇ m and CS is the figure of surface compressive stress (given in MPa) measured at the first surface.
  • the CT of these embodiments can be more than or equal to 27 MPa, further preferably more than or equal to 45 MPa, further preferably more than or equal to 65 MPa, further preferably more than or equal to 100 MPa.
  • the surface CS at the first surface and/or at the second surface of soda lime glasses can be equal to or more than 200 MPa, preferably equal to or more than 300 MPa.
  • the glass articles can be used for example in the following application fields of display substrate or protection cover, finger print sensors cover, general sensor substrate or cover, cover glass of consumer electronics, protective covers of displays and other surfaces, especially bended sur-faces. Moreover, the glass articles may also be used in the applications of display substrate and cover, fragile sensors, fingerprint sensor module substrate or cover, semiconductor package, thin film battery substrate and cover, foldable display, camera lens cover. In specific embodi-ments, the glass articles may be used as cover film for resistance screens, and expendable protective films for display screens, cell phones, cameras, gaming gadget, tablet, laptops, TV, mirror, windows, aviation widows, furniture, and white goods.
  • the invention is especially suitable for being used in flexible electronic devices providing thin, lightweight and flexible properties (e.g. curved displays, wearable devices) .
  • Such flexible devic-es also requires flexible substrates e.g. for holding or mounting components.
  • flexible displays with high contact resistance and small bending radii are possible.
  • the invention is especially suitable for being used for forming a laminated layered struc-ture, wherein the laminated layered structure comprises at least two ultrathin glass layers and an organic layer between them, wherein at least one glass layer is a chemically toughened glass article according to the invention and wherein the organic layer preferably is selected from the group consisting of optical clear adhesive (OCA) , optical clear resin (OCR) , polyvinyl butyral (PVB) , polycarbonate (PC) , polyvinyl chloride (PVC) and thermoplastic polyurethane (TPU) .
  • OCA optical clear adhesive
  • OCR optical clear resin
  • PVB polyvinyl butyral
  • PC polycarbonate
  • PVC polyvinyl chloride
  • TPU thermoplastic polyurethane
  • the ultrathin chemically toughened glass article is used for forming a laminated layered structure (also called “glass laminate” ) .
  • the laminated layered structure comprises for example two ultrathin glass layers and an organic layer between them. At least one of these UTG layers is a glass article according to the invention.
  • the glass laminate comprises one toughened and one untoughened glass layer, wherein the toughened glass layer has at least one toughened surface which is located at the outer side of the glass laminate.
  • both UTG layers can be glass articles according to the invention (that means the glass laminate comprises two toughened glass layers) . In the latter case pref-erably each glass layer has at least one toughened surface which can be located at the outer side of the glass laminate.
  • the glass laminate can be composed of more than two ultrathin glass layers. Glass laminates having three, four, five and more UTG layers (toughened and/or untoughened in any combination) are also possible with organic layers between the UTG layers.
  • An organic layer is preferably selected from the group consisting of optically clear adhe-sive (OCA) , optically clear resin (OCR) , polyvinyl butyral (PVB) , polycarbonate (PC) , polyvinyl chloride (PVC) and thermoplastic polyurethane (TPU) .
  • OCA optically clear adhe-sive
  • OCR optically clear resin
  • PVB polyvinyl butyral
  • PC polycarbonate
  • PVC polyvinyl chloride
  • TPU thermoplastic polyurethane
  • the glass laminate can comprise at least one toughened glass layer having a low DoL or having a high DoL. It may be advantageous if the glass laminate comprises a laminated polymer layer and/or a coated layer at least on one side wherein the polymer layer has a thickness of at least 1 ⁇ m, preferably of at least 5 ⁇ m, further preferably of at least 10 ⁇ m, more preferably of at least 20 ⁇ m, most preferably of at least 40 ⁇ m to reach the improved sharp contact resistance.
  • the laminated polymer layer can cover the surface of the glass laminate completely or partly.
  • the glass laminate can comprise glass layers having the same thickness and/or DoL.
  • the glass laminate can comprise ultrathin glass layers with different thicknesses and/or different DoL.
  • the glass laminate can have the structure “0.05 mm glass layer + OCA/OCR + 0.07 mm glass layer” , wherein the glass layers have the same DoL (for example 6 ⁇ m) .
  • Another structure can be “0.05 mm glass layer (DoL 11 ⁇ m) + OCA/OCR + 0.07 mm glass layer (DoL 4 ⁇ m) .
  • a laminated layered structure may have a higher strength or stability compared to a monolithic glass article of the same thickness.
  • the layers of the laminated layered structure can be made of thin or very thin glass, thus enabling the layered structure to be thin and flexible without any effect on the overall strength or stability.
  • the bending per-formance of a glass laminate may be even better than that of a monolithic glass article.
  • a glass laminate comprising two 0.05 mm toughened glass layers and an OCA layer between them may have a lower bending radius than a glass article having a thickness of 0.1 mm.
  • a glass laminate offers more protection. Even if the ultrathin glass layer located at the outside of the glass article is ruined, there is still another glass layer on the backside for protection.
  • the invention is also a method of producing a glass article according to the inven-tion, the method comprising the following steps:
  • toughening temperature and/or toughening time is re-duced in order to achieve an inventive glass article having an optimized stress profile.
  • the flat glass process is a down draw process or a redraw process.
  • the chemically toughening process comprises an ion-exchange process.
  • the ion-exchange process comprises immerging the glass article of a part of the glass article into a salt bath containing monovalent cations.
  • the monovalent cations are potassium ions and/or soda ions.
  • the chemical toughening comprises two consecutive toughening steps, wherein the first step comprises toughening with a first toughening agent and the second step comprises toughening with a second toughening agent.
  • the first toughening agent and the second toughening agent comprise or consist of KNO 3 and/or NaNO 3 and/or mixtures thereof.
  • Fig. 1 a simplified illustration of the sandpaper ball drop test.
  • Fig. 2 average breakage height of comparison and working examples of glass type 1,
  • Fig. 3 B10 breakage height of comparison and working examples of glass type1
  • Fig. 4 average breakage height of working examples (embodiment 2) .
  • Fig. 5 B10 breakage height of working examples (embodiment 2) .
  • Table 1 shows the compositions of several typical embodiments (types 1 -5) of direct hot-forming ultrathin glasses which are chemically toughenable.
  • Glass articles 1 of the different glass types were produced in a down draw process and chemi-cally toughened to form ultrathin chemically toughened glass articles.
  • Each ultrathin glass article has a first surface 2 and a second surface 3.
  • each sample repre-senting a glass article is toughened on both sides. So there is a compressive stress region with a certain depth (DoL) on each side of the glass article. All samples were cut out of a larger glass article by using diamond cutting wheel. The samples were tested without any further edge treatment (e.g. polishing, etching) .
  • FIG. 1 A simplified illustration of that test is shown in Fig. 1.
  • a glass article 1 is placed with its second surface 3 on a steel plate 4.
  • the first surface 2 of the glass article 1 is orientated upwardly.
  • a sandpaper 5 of type P180 is placed on the glass article in such a way that its abrasive side is in contact with the first surface 2 of the glass article 1.
  • An acrylic ball 6 having a weight of 4.5 g is dropped from above onto the sandpaper 5.
  • the break-age height also called “ (sandpaper) ball drop height”
  • the break-age height is the maximum height from that the ball can drop onto the glass sample until it gets a visible surface crack or breaks into two or several pieces. 20 toughened samples of each thickness and each DoL were tested and evaluated. The average breakage height was calculated as described above, and the B10 height was cal-culated using Weibull method.
  • Table 2 shows the test results conceming impact resistance and bending radius for the compar-ison examples A to F (average values and calculated B10 values using Weibull method) .
  • Fig. 2 the results of the sandpaper ball drop test (average breakage height) are given for the com-parison examples A to F.
  • a vertical line indicates the spread of the measured values around the corresponding average value in each case.
  • Fig. 3 the calculated B10 heights are given for the comparison examples A to F.
  • Embodiment 1 -Glass type 1
  • FIG. 2 shows the average breakage heights (the results of the sandpaper ball drop test) of samples having a thicknesses of 0.05 mm, 0.07 mm, 0.1 mm, 0.145 mm, 0.21 mm, 0.25 mm and 0.33 mm and different DoL for working examples 1 to 14.
  • a vertical line indicates the spread of the measured values around the corresponding average value in each case.
  • the calculated B10 heights are given for the working examples 1 to 14.
  • Fig. 2 and 3 it can be seen clearly that for example 0.1 mm thick glass type 1 sam-ples with a DoL of less than 10 ⁇ m (examples 5 -7) have higher average sandpaper ball drop height and higher B10 ball drop height until breakage than samples of the same thickness with a higher DoL (comparison examples C and D) .
  • the working examples are quite more re-sistant against high sharp impact contact than the comparison examples.
  • the same results can be seen when comparing other examples of corresponding thicknesses (e.g. 0.05 mm, 0.07 mm, 0.21 mm) with one another (comparison examples versus working examples) .
  • fig-ures show that both the average ball drop height and the B10 ball drop height increase when DoL decreases, referred to working examples having the same thickness (e.g. working exam-ples 5 -7 or working examples 9 and 10) .
  • the different DoLs are realized by varying the tough- ening conditions (in this case the toughening time at a quite low toughening temperature) , as shown in Table 2 and 3.
  • ultrathin glass is toughened to get surface CS of 828 MPa and DoL of 9 ⁇ m, and the resultant CT is only 90 MPa (Ex. 7) .
  • the glass article has a B10 ball drop height of 9.2 mm Thus its breakage height (in mm) is > 5 (calculated by: ⁇ 50 * 0.1) .
  • the average breakage bending radius of that embodiment is ⁇ 7 mm.
  • its break-age bending radius is within the criterion “ ⁇ 12” (as calculated by: ⁇ 100000 * 0.1/828) , and even more within the criterion “ ⁇ 7.2” (as calculated by: ⁇ 60000 * 0.1/828) .
  • such a glass articles has an optimized stress profile with a balance between high flexibility (small bending radius) and high sharp contact resistance.
  • comparison example C is a 0.1 mm thick ultrathin glass and is toughened to get surface CS of 811 MPa and DoL of 11 ⁇ m, and the resultant CT is 114 MPa.
  • the glass arti-cle has a B10 ball drop height of 4.2. Thus its breakage height (in mm) is ⁇ 5 (calculated by: 50 * 0.1) .
  • the average breakage bending radius of that embodiment is ⁇ 7 mm.
  • its break-age bending radius is within the criterion “ ⁇ 12” (as calculated by: ⁇ 100000 * 0.1/811) , and even more within the criterion “ ⁇ 7.4” (as calculated by: ⁇ 60000 * 0.1/811) .
  • Examples 17 and 18 have an improved resistance against sharp impact forces although the DoL of the samples is quite high. This is achieved by laminat-ing a polymer layer on the glass wherein a thicker polymer layer of 50 ⁇ m is a better protection against sharp impact forces than thinner ones.
  • Ex. 15 are glass samples without a lamination. Due to the properties of the lamination material a 50 ⁇ m layer of PET seems to have a better effect than a 50 ⁇ m layer of PE.
  • Embodiment 3 -Glass type 2
  • Example 19 was toughened in one step, while examples 20 to 22 are toughened in two steps. After ion-exchange, the toughened samples were cleaned and measured with FSM 6000. Then the contact resistance against sharp hard objects were tested by a sharp impact experiment (sandpaper ball drop test) as described above. In addition the breakage bending radius was measured by the 2 point bending method described above using samples having a length of 70 mm and a width of 20 mm. In each test/experiment a plurality of 20 samples of each thickness and each DoL-type were tested and evaluated as described in connection with embodiment 1. Table 5 shows the sample conditions and results of the experiments (working examples 19-22) .
  • Samples of glass type 3 having a length of 11 mm, a width of 11 mm and a thickness of 0.21 mm were prepared and chemically toughened. Different toughening conditions are used to have different CS and DoL. After ion-exchange, the toughened samples were cleaned and measured with FSM 6000. Then the contact resistance against sharp hard objects were tested by sharp impact experiment (sandpaper ball drop test) as described above. In addition the breakage bending radius was measured by the 2 point bending method described above using samples of each thickness having a length of 70 mm and a width of 20 mm. In each test/experiment a plu-rality of 20 samples of each DoLwere tested and evaluated as described in connection with em-bodiment 1. Table 6 shows the sample conditions and results of the experiments (working ex-amples 23-25) .
  • Samples of glass type 4 having a length of 11 mm, a width of 11 mm and a thickness of 0.145 mm were prepared and chemically toughened. Different toughening conditions are used to have different CS and DoL. After ion-exchange, the toughened samples were cleaned and measured with FSM 6000. Then the contact resistance against sharp hard objects were tested by sharp impact experiment (sandpaper ball drop test) as described above. In addition the breakage bending radius was measured by the 2 point bending method described above using samples of each thickness having a length of 70 mm and a width of 20 mm. In each test/experiment a plu-rality of 20 samples of each DoL were tested and evaluated as described in connection with embodiment 1. Table 7 shows the sample conditions and results of the experiments (working examples 26-28) .
  • the CT of this glass type is very low. However, it can have better impact resistance to sharp and hard objects, even if the CS is not high.
  • Samples of glass type 5 having a length of 11 mm, a width of 11 mm and a thickness of 0.1mm were prepared and chemically toughened. Different toughening conditions are used to have different CS and DoL. After ion-exchange, the toughened samples were cleaned and measured with FSM 6000. Then the contact resistance against sharp hard objects were tested by a sharp impact experiment (sandpaper ball drop test) as described above. In addition the breakage bending radius was measured by the 2 point bending method described above using samples having a length of 70 mm and a width of 20 mm. In each test/experiment a plurality of 20 sam-ples of each DoL were tested and evaluated as described in connection with embodiment 1. Table 8 shows the sample conditions and results of the experiments (working examples 29-31) .
  • the strength of the ultrathin chemically toughened glass articles according to the in-vention which is determined by the sandpaper ball drop test follows Weibull distribution. B10 values defining the heights when 10 %of the samples are broken are given in Tables 2-7.

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